Improved coated sheet metal



UNITED STATES PATENT QFFIGE.

GEORGE H. HAZELTON, OF PHILADELPHIA, PENNSYLVANIA.

IMPROVED COATED SHEET METAL.

Specification forming part of Letters Patent No. 59,599, dated November 13, 1866.

To all whom it may concern Be it known that I, GEORGE H. HAZELTON, of Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented a new and useful article of Coated Sheet Metal, suitable for the manufacture of kettles, pots, boilers, and other culinary and household vessels, for roofing, gutters, and other purposes for which sheet-copper, sheet-brass, tin-plate, and the like are ordinarily used; and I hereby declare the following to be a full and exact description of the same.

Large quantities of sheet-copper are used for roofing, and for the manufacture of kettles, boilers, and other vessels. For these uses copper is well adapted on account of its strength and ductility. It has, however, the great disadvantage that it is corroded easily by air and moisture, and produces, by corrosion, compounds which are very poisonous. As a roofing material it has also the defect of readily absorbing heat from the suns rays, which, with its great expansion by heat and contraction by cold, makes it very difficult to secure it upon a roof, so that a copper roof requires constant attention to keep the joints from being torn open by the expansion and contraction of the separate sheets.

The object of my invention is to prepare an improved article of sheet-copper suitable forall the uses above mentioned, and which is much better for many other purposes than ordinary sheet-copper.

My invention consists in coating sheet-copper with an alloy of tin and lead, or with an alloy of tin, lead, and antimony, in the manner and about the proportions hereinafter set forth.

The following description will enable others to make and use my invention.

I take sheet-copper, such as is found in commerce, and is prepared by rolling copper ingots into plates or sheets. These sheets are cleansed of scale by pickling, scouring, or scrubbing, in the manner well known to metal-platers. The sheets thus prepared are then coated, in the manner usual in preparing tinned iron, with an alloy of tin and lead, made by combining about fifty-five parts of tin with fortyfive parts of lead; or, when I wish the coating to be very hard, I add about two per cent. of antimony. Copper thus coated is not corroded by alkalies or dilute acids, nor by heat and air moisture, as is the uncoated copper. It has a bright reflecting-surface, which throws off the suns rays, and therefore, when applied in roofing, it is much less affected by expansion and contraction from daily and hourly changes of temperature.

Sheets of copper coated in this manner are also more easily joined by soldering, and the solder-joint is more durable.

Having thus described my invention, what I claim, and desire to secure by Letters Patent of the United States, is

The use and manufacture of sheet-copper coated substantially as herein set forth and described.

- GEORGE H. HAZELTON.

Witnesses E. H. HAZELTON, EDWARD M. MANIGLE. 

